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Analytical and Empirical Characterization of Hybrid Rocket Swirl Injection Presenters: Matt H. Summers Advisor: James K. Villarreal
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Daedalus Astronautics Dual Purpose: Teaching rocketry and basic physics to k-12 students Advanced propulsion research/Sounding rockets
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Project Motivation Analytics: - Preliminary computational fluid dynamic analysis - rapid results - Low cost Empirical: - Minimized testing – Low cost - Develop an empirical characterization of hybrid swirl injection Future Work: - Ability to test multiple components of a Hybrid Rocket Motor - Long-term, low-cost, easy apparatus - Great predictor for future research
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Analytics Results: - 600 psi Tank Pressure - 400 psi chamber pressure - Turbulent flow achieved -Increased oxidizer mass flux Figures shown are using a 60° super-critical injector. Top-Right: Density distribution in CTRZ flow structure. Bottom-Right: Constant pressure distribution in HRM. Left: Varying Temperature distribution in HRM. CTRZ: Central Toroidal Recirculation Zone
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Design Selected Injectors: - No Swirl - 0° Swirl - 15° Swirl - 20° Swirl - 30° Swirl - 35° Swirl - 42° Swirl - 60° Swirl Figure here shows how hybrid swirl injectors are classified based on their radial injection angle.
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Fabrication Selected Injectors: - No Swirl - 0° Swirl - 15° Swirl - 20° Swirl - 30° Swirl - 35° Swirl - 42° Swirl - 60° Swirl Example of print created for the 42° swirl injector Machined injectors with their respective swirl angles
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Cold-Flow Testing Results: - No Swirl Test - 2 sec test - 0.6 lb ∆ M in Tank - Mass Flow Rate = 0.3 lb/s - No CTRZ - 60° Swirl Test - 2 sec test - 0.6 lb ∆ M in Tank - Mass Flow Rate = 0.3 lb/s - CTRZ Formation Flow of No Swirl Injector Flow of 60° Swirl Injector Forward Enclosure deflects swirl flow to initiate CTRZ No CTRZ present – no pre-heating
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Hot-Fire Testing Upon completion of the motor case. Testing of Full-Scale Hybrid Rocket Motor on Campus Before After
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Empirical Current Equation for regression rate of HTPB fuel grain Potential Equation for regression rate of HTPB fuel grain Swirl Flow passing through the Pre- Combustion Chamber
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